Update scikit-learn to 0.22.1

[pyup-bot]

This PR updates scikit-learn from 0.20.0 to 0.22.1.

Changelog

### 0.22.1 ``` We're happy to announce the 0.22.1 bugfix release. Change log under https://scikit-learn.org/stable/whats_new/v0.22.htmlchanges-0-22-1. This version supports Python versions 3.5 to 3.8. ``` ### 0.22 ``` We're happy to announce the 0.22 release. You can read the release highlights under https://scikit-learn.org/stable/auto_examples/release_highlights/plot_release_highlights_0_22_0.html and the long version of the change log under https://scikit-learn.org/stable/whats_new/v0.22.htmlchanges-0-22. This version supports Python versions 3.5 to 3.8. ``` ### 0.21.3 ``` A bug fix and documentation release, fixing regressions and other issues released in version 0.21. See change log at https://scikit-learn.org/0.21/whats_new/v0.21.html ``` ### 0.21.2 ``` This version fixes a few bugs released in 0.21.1. ``` ### 0.21.1 ``` See changes at https://scikit-learn.org/0.21/whats_new/v0.21.html Fixes some packaging issues in version 0.21.0 along with a few bugs. ``` ### 0.21.0 ``` A new release of Scikit-learn with many new features, enhancements and bug fixes. See https://scikit-learn.org/0.21/whats_new/v0.21.html ``` ### 0.20.4 ``` Builds on top of Scikit-learn 0.20.3 to fix regressions and other issues released in version 0.20. See change log at https://scikit-learn.org/0.20/whats_new/v0.20.html ``` ### 0.20.3 ``` A bug-fix release in the 0.20 series, supporting Python 2 and 3 ``` ### 0.20.2 ``` Bug-fix release to the 0.20 branch, supporting Python 2 and 3 ``` ### 0.20.1 ``` Released 21 November 2018. See changelog at https://scikit-learn.org/0.20/whats_new.htmlversion-0-20-1 ```

Links

- PyPI: https://pypi.org/project/scikit-learn - Changelog: https://pyup.io/changelogs/scikit-learn/ - Homepage: http://scikit-learn.org